I have been fighting a weird issue with my truck for over a year and have upgraded every fuel delivery item that can be thought of in the process. My injector pulse width will randomly drop to half of its normal value if you build above 15-18 psi of boost. Truck is normal under 15-18 psi but above that its similar to being in limp mode. Once it does it once it will continue until I turn the truck off and let it sit for a few hours. Seems to be somewhat heat related (as in when the truck is warm its more likely to occur versus cold), but also happens anytime you try to hold the truck with the brakes while building boost.
I feel my last 2 things that can be wrong are the FICM or the injection pump. I dont feel like the pump is bad because there is very little difference in the desired and actual rail pressure. I am getting no codes so Im kind of in the dark. Is there a way I can check my Fuel Injection Control Module? Or is there anything else that may be wrong? Any help is greatly appreciated.
I feel my last 2 things that can be wrong are the FICM or the injection pump. I dont feel like the pump is bad because there is very little difference in the desired and actual rail pressure. I am getting no codes so Im kind of in the dark. Is there a way I can check my Fuel Injection Control Module? Or is there anything else that may be wrong? Any help is greatly appreciated.
